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B (Salters) F331 (Chemistry for Life) 22nd May 2015 [Official Thread] watch

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    Hess' law barely comes up. Out of all the papers its only come up like three times though
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    What did the gold foil experiment prove ??
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    That was an alright paper. Definitely got the last question wrong because it was [SiO4]4- and I derped and wrote [SiO2]2-. Also got the cyclopropane angle wrong, wrote 120 instead of 60. What about everyone else?

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    How did you guys find the exam? I thought it was quite good tbh
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    it was quite good, but i have lost 3 marks i think, but thats it i am pretty sure.
    What was the ans for period and group? I put the number of electron shell and outer electron, its that fine?
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    Absolute gift of an exam, providing the last question gave SiO3 2-??????

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    (Original post by misteltain)
    That was an alright paper. Definitely got the last question wrong because it was [SiO4]4- and I derped and wrote [SiO2]2-. Also got the cyclopropane angle wrong, wrote 120 instead of 60. What about everyone else?

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    The predicted one is 109 because there are 4 areas of electron density around the central carbon atom but the actual is 120

    Oh wait im wrong the predicted one is 109 but the actual is 60...
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    (Original post by Bellbird)
    it was quite good, but i have lost 3 marks i think, but thats it i am pretty sure.
    What was the ans for period and group? I put the number of electron shell and outer electron, its that fine?
    Yeah thats what i put

    Period no: no. of electron shells
    Group no: no. of electrons on the outer shell
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    (Original post by shooting_stars)
    Yeah thats what i put

    Period no: no. of electron shells
    Group no: no. of electrons on the outer shell
    ^ correct

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    What did you guys put for why is the bond enthalpy an average?
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    What did everyone get the volume question?
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    (Original post by HecTic_H)
    What did everyone get the volume question?
    200 and something

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    That was awful

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    (Original post by vuvuzela)
    Absolute gift of an exam, providing the last question gave SiO3 2-??????

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    The question asked for a silicon ion so I put Si4+

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    (Original post by TheGreatImposter)
    The question asked for a silicon ion so I put Si4+

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    I wrote Si4+ as well
    Has 4 electrons in outer shell
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    (Original post by TheGreatImposter)
    The question asked for a silicon ion so I put Si4+

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    That's the same thing I did... I didnt realise they asked for silicate not slicon one
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    (Original post by Marli-Ruth)
    I wrote Si4+ as well
    Has 4 electrons in outer shell
    They asked for silicate (which means it has oxygen) not silicon ion.. I did the same mistake
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    (Original post by vuvuzela)
    200 and something

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    200 and something as well lol
    277 I think around that but I did it wrong I'm sure
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    SiO3?2- is correct

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    Who else got 278 for the volume of the gas?
 
 
 
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